Apparatus for the manufacture of double-walled vacuum-receptacles.



Y 0. MOBERG & E. HOOGE,

APPARATUS FOR THE MANUFACTURE OF DOUBLE WALLED VACUUM RECEPTACLES. APPLICATlOU FILED AUGJIZ. 1914.

1,199,482. v PatentedSept.--26, 1916 I 2 SHEETS-SHEET 1- -6 1 10 MPH j EL Z0 37 a i o I 4 F 1 J V A A INVENTORSQI ITNESSE p S I Oscar Maker q: 1

Edward Henge:

' T EM TTORNEY O. MOBERG &. E. HOOGE. APPARATUS FOR THE MANUFACTURE OF DOUBLE WALLED VACUUM RECEPTACLES;

APPUCATLON FILED AUG.12. 1914.

1,199,482. PatentedSpt. 26,1916.

2 SHEETS-SHEET 2.

WITNESSES: I NVENTORS. 44 5 W Oscar/Weber Edward Hoo qe: "BY

v THEIRATTORNEY.

UNITED s'rArEs PATENT ensues.

OSCAR MOBERG AND EDWARD HOOGE, or NEW BRITAIN, CONNECTICUT, Assmlvons 'ro LANDERS, ERARY & CLARK, or NEW BRITAIN, CONNECTICUT, ooRP'oRATIoNoE CONNECTICUT.

APPARATUS FOR THE MANUFACTURE OF DOUBLE-WALLET!) VACUUM-REGEPTACLES.

Specification of Letter Patent.

Application filed August 12, 1914. Serial N 0. 856,383.

To all whomit may concern Be it known that we, OSCAR Momma and EnwAnn Hooon, citizens of thellnited States, and residents of New Britain, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Apparatus for the Manufacture of Double-Billed Vacuum-Receptacles, of which thefollowing is a specification.

This invention relates particularly to the manufacture of vacuum bottles or similar receptacles, and particularly'to certain operations in the process of manufacture which take place after the two blanks are assembled together.

The invention relates both to the methods employed and to the appaiatus used, the object of the invention being to simplify the operations and reduce the cost of manufacture and at the same time produce a uniform product-of high quality.

In the drawings there is illustrated the novel apparatus by which the new method of manufacture hereinafter to be described may be carried out to very good advantage.

Figure 1 is a side view of the apparatus. Fig. 2 is a top view thereof. Fig. 3 is a view similar to Fig. 1 but showing the bottom mold. Fig. 4 is a detail yiew showing a step in the operation of closing in the bottom of the outer member when it is of what will be termed the skirted type. Fig. 5 1s a detail view showing the rse of the bottom mold. fig. 6 is a detail view showing the use of the localized flame for forming the aperture to which the exhausting tube is secured.

Vacuum receptacles, such as the well known vacuum bottles, are formed of inner withrth'e air between the walls exhausted to andzouter bottles sealed together-at the neck,

a greater or less extent so as to provide wh at is usually termed a vacuum insulation. in the course of manufacture the, inner bottle or blank A is formed up to shape, and the outerblank B has its neck portion properly shaped to conform to the neck portion of tha inner blank, but its lower end is left open in order that the inner blank may be assembled within it, where it is held by supports2in suitable spaced relation. These supports by which the two blanks are supported, one from and by the other, are the salre supports which are customarily used between the walls of a vacuum bottle near Patented Sept. 26,1916.

tom of the outer blank before the two blanks are joined together at the lip, and in consequence 1t is possible to introduce air pres sure within the outer bottle toqhiore accurately form and shape its bottom, and also to produce the small hole to which the exhausting tube is attached. It has also been possible to eliminate special holding and centering devices, formed as a part of the machine or apparatus, and which it has heretofore been customary to use to prop erly position the inner blank within the outer one. These details in manufacture will be more fully described hereinafter.

' It is the utilization of means permanently located between the walls of the blanks, as

'for instance the ordinary spacing supports,

to support one of the blanks from and by the other, wh ch constitutes an important feature of this invention.

Having the two blanks assembled together and supported in proper spaced relation withrespect to one another, the next step in the process is the closing in of the bottom of the outer blank. This step in the process is best carried on while the blank is rotating, and for this purpose a chuck 5 is provided into which the outer blank is secured, the chuck being provided with proper- ;drrving apparatus as the pulley (5. fast on the chuck shaft which Is supported in the bearing 1. The'chuck shaft is made hollow and communicates with the interior of the chuck in order that air supplied in any way, as for instance by a blow pipe con nected to the tube 8, may be supplied to the interior of the outer bottle. ing supported in and rotated by the chuck. heat is applied to the end of the outer blank,

as by the gas flames 9, 9. and the glasslhe blanks beheated until it becomes soft enough to be drawn out to roughly close in the bottom.

This leaves the bottle very rough and uneven, but by-the application of heat and ofa slight a11- pressure within the bottle, while it is being rotated by the chuck. the bottom 1 can be finished with a suitable degree of accuracy both as regards its shape and its spacing from the bottom of the inner blank. In order to produce a uniform product it is advisable as :t final operation of this step, to slide up against the finished end a properly shape mold mounted on a slide 25, which comes up against the stop 11, properly positioning the mold with respect to the bottom of the inner blank. This mold is preferably of carbon, and finally shapes the bottom of the outer blank and spaces it accurately with respect to the bottom of the inner blank; while the bottom of the outer blank is rotating in this mold, a slight air pressure within the blank will insure an even and finished product.' The mold can be slid back out of the way when it is no longer needed. The bottom of the outer blank .now being completed, it is necessary to form a hole in the outer blank and preferably near the bottom, to which the exhausting tube may be attached. lhis hole is formed by localizing the heat at the as jet l5, and

proper point, as by the small I when the glass has been heated to a sufiioient extent, the production. of a slight air pressure within the blank will break the softened glass away, leaving a small aperture to which one end of a short exhausting tube may be attached. By preference this small jet 1'5; is supported by an arm which is pivoted as at 16, and the jet is normally held in raised position by the spring 17, but in such relation to the blank as it is held in the chuck that when it is pressed toward the blank the jet, will play upon the blank at about the right spot. The two blanks are now completed ,and'ready to be sealed together at the lip, a part of the process of manufacture withiwhich the present invention is not concerned.

' In some cases, after the two blanks have been assembled together, the bottom ot the outer blank is heated and drawn down roughly to shape but not necessarily closed in, in which case it is only necessary, after the blanks have been placed in the chuck shown in the drawings, to heat the glass, close in the bottom and break oil the waste material, after which the process of shaping and completing the outer bottle can be proceeded with in the manner hereinabove de scribed. In other cases, after the two blanks have been assembled together, the outer blank is left in the form in which it was originally made, with what we have termed the skirt 20; When the outer blank is of this character, as shown in Figs. 1, 2 and 3, the first step in the process of finishing the bottom is to close in the blank and take away the waste material. In order to :10

this, the following described instrumentdi' mold l0, and arranged at right angles there to a bracket arm 27, upon which is supported a bearing 28 in such manner that it can freely move to a slight extent in any direction. This bearing 28 carries a shaft 29 upon which are mounted the clips 30 which grip. the edgeof the skirt as in Fig. 1. A spring 31. is connected between the rear end of the bearing and the bracket arm 27. The shaft 29 is substantially in alinement with the axis of the blanks, and as the blanks are rotated by the chuck the clips 30, 30, of course rotate, and they are free to move or gyrate as it were, in order to follow the motion of the end of the outerblank and avoid subjecting it to any-strain which would tend to crack or break it. As the blank is rotated, the skirt being held by the clips, it is heated by the flames 9, 9, and as the glass becomes soft the clips 7 30 will gradually cease their rotation and the slide 25 may be .drawnback, with the result that the bottom of the outer blank is closed in as shown in Fig. l, and the waste material held by the clips is drawn away and severed from the blank. The hereinabove described method of shaping and finishing the bottom of the outer blank is then proceeded with, and when it is desired to use the mold, the spindle 26 is turned until the mold is in proper position, and then the slide is advanced until it brings up against the stop 11.

As will be clearly seen the stop 11 is adjustable. The mbld 1.0 is adjustable on the spindle 26, as is also thebracket arm 27, in order to accommodate the changes or variations in the size of the blanks which are being operated upon. It will of course be apparent that the clips 30 perform no function in supporting the blanks while they are being operated upon, as the entire support is furnished by the chuck. The support for the bearing 28 in, the bracket arm 2? is in the nature of a universal joint, and the spring 31 is just strong enough to over-balance the oveight of the clips 30, with the result that the blank is subjected to no strain by these parts.

llm impoitant feature of the invention resides in the successive relation of the various steps in the process of completing the doublewalled""structure from the two blanks, namely, the assembly of the blanks, the insertion of supports between the blanks, and the closing of the bottom of the outer blank,

which is done before the lips are united, and,

is usual, the neck is contracted, the holding of the mner blank in position solely by the supports It is obvious that the apparatus here de-.

scribed is susceptible of various changes and alterations without departing from the scope of the invention as defined by the appended claims.

We claim as our invention:

1. In a machine for closing in, shaping and finishing the bottom of an open-ended outer blank of a double-walled vacuum receptacle, below and spaced from the closed bottom of the inner blank which is positioned therein, a solid-walled'chuck provided with a deep recess in its face and a clamping device at its front end to support and hold the neck of the outer blank with its end spaced from the bottom of said recess, means for rotating said chuck, and, means for introducing. air under pressure within said chuck at the bottom of said re cess.

2. In a machine for closing in, shaping, and finishing the bottom of an openended outer blank of a double-walled vacuum receptacle, below and spaced from the closed bottom of the inner blank which is posi-' tioned therein, a solid-walled chuck provided with a deep recess in its face and a clamping device at its front end to support and hold the neck of the-outer-blank with its end spaced from the bottom of said recess, means for rotating said chuck, means for introducing air under the bottom of said recess, and a. mold arranged in axial alinement with said chuck, and adapted-"for movement toward and away from said chuck.

pressure within said chuck at v 3. In a machine for closing, finishing the bottom of the outer member of a vacuum receptacle which has positioned Within it an inner blank closed at its bottom, a blank-holding chuck to receive and shaping and grip the outer blankat its neck, means for tion, and means 'for' supplying air under pressure to the interior of said blank.

character described,

4. In a machine of the the combination with a rotatable blank-holding'chuck, of a slide, a'turret head thereon,

a pair of clips carried by. said turret and adapted to engage an end of a bottle blank,

a rotary support for said clips, and carrying means for said supportin the nature of .a universal joint,-"moun'ted"on said turret head. a

OSCAR.MOBERG.-'

4 *EDWARD-HOOGE. witnessesz' IABT'HUR T. EVANS, 

